diff --git a/code/__DEFINES/text.dm b/code/__DEFINES/text.dm
index 26567be26255..dc58682d9483 100644
--- a/code/__DEFINES/text.dm
+++ b/code/__DEFINES/text.dm
@@ -24,3 +24,5 @@
 #define MAX_PAPER_MESSAGE_LEN 3072
 #define MAX_BOOK_MESSAGE_LEN 9216
 #define MAX_NAME_LEN 28
+
+#define MAX_MESSAGE_CHUNKS 20
diff --git a/code/modules/tgui/tgui.dm b/code/modules/tgui/tgui.dm
index c52508e01a93..09618180e671 100644
--- a/code/modules/tgui/tgui.dm
+++ b/code/modules/tgui/tgui.dm
@@ -43,6 +43,9 @@
 	/// If the window should be closed with other windows when requested
 	var/closeable = TRUE
 
+	/// Any partial packets that we have received from TGUI, waiting to be sent
+	var/partial_packets
+
 /**
  * public
  *
@@ -345,6 +348,30 @@
 	// Pass act type messages to ui_act
 	if(type && copytext(type, 1, 5) == "act/")
 		var/act_type = copytext(type, 5)
+
+		var/id = href_list["packetId"]
+		if(!isnull(id))
+			id = text2num(id)
+
+			var/total = text2num(href_list["totalPackets"])
+			if(id == 1)
+				if(total > MAX_MESSAGE_CHUNKS)
+					return
+
+				partial_packets = new /list(total)
+
+			partial_packets[id] = href_list["packet"]
+
+			if(id != total)
+				return
+
+			var/assembled_payload = ""
+			for(var/packet in partial_packets)
+				assembled_payload += packet
+
+			payload = json_decode(assembled_payload)
+			partial_packets = null
+
 		log_tgui(user, "Action: [act_type] [href_list["payload"]]",
 			window = window,
 			src_object = src_object)
diff --git a/tgui/public/tgui.html b/tgui/public/tgui.html
index 70ef812c69f9..780868653936 100644
--- a/tgui/public/tgui.html
+++ b/tgui/public/tgui.html
@@ -205,9 +205,28 @@
       ? { type: type, payload: payload }
       : type;
     // JSON-encode the payload
+
     if (message.payload !== null && message.payload !== undefined) {
       message.payload = JSON.stringify(message.payload);
+
+      if(!Byond.TRIDENT && message.payload.length > 512) {
+        var chunks = [];
+
+        for(var i = 0, charsLength = message.payload.length; i < charsLength; i += 512) {
+          chunks.push(message.payload.substring(i, i + 512))
+        }
+
+        for(var i = 0; i < chunks.length; i++) {
+          var to_send = chunks[i]
+
+          message = { type: type, packet: to_send, packetId: i + 1, totalPackets: chunks.length, tgui: 1, window_id: Byond.windowId };
+          Byond.topic(message);
+        }
+
+        return;
+      }
     }
+
     // Append an identifying header
     assign(message, {
       tgui: 1,
diff --git a/tools/build/build.js b/tools/build/build.js
index 9efee60ebd31..0df8bb67c9b0 100644
--- a/tools/build/build.js
+++ b/tools/build/build.js
@@ -68,6 +68,7 @@ export const DmTarget = new Juke.Target({
     "html/**",
     "icons/**",
     "interface/**",
+    "tgui/public/tgui.html",
     `${DME_NAME}.dme`,
     NamedVersionFile,
   ],